Picsynth

The PICSynth project uses 2 digitally controlled oscillators along with analog waveshaper and a voltage-controlled filter resulting in some very sweet sounds.

  • Dual oscillator mono synth
  • Really easy to build using just 1 custom programmed PIC chip, 4 ICs and single 12v supply
  • All circuits built on veroboard – no printed circuit board making skills needed
  • PIC based dual oscillator and digital keyboard scan
  • Analog VCF/VCA/Envelope
  • Waveforms : sawtooth, square (with pulse width adjust), triangle
  • Tuning presets : in-sync, out-sync, detune1 and detune2
  • Expandable, first two modules shown below.

It uses mostly readily available parts (supposing you have an old keyboard to salvage), unfortunately no source code is available – programmed PICs are sold via the site – PICSynth

Update: The author sends word that the project has moved to a new site.

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Avrsynth
How to build a modular AVR synth